Head for glass-lined tanks



NOV. 28, 1944. r w LAUcK 2,363,980

HEAD FOR GLASS LINEI TANKS Filed April 21, 1943 Francis WILazlck INVENTOR.

Patented Nov. 28, 1944 l UNITED STATES -IPAT.ENT' OFFICE nnan non cuss-mun TANKS Francis W. Lauck, Milwaukee, Wis., assignor to A. 0. Smith Corporation, Milwaukee, Wis., a

corporation of New York Application April 21, 1943, Serial No. 433,901

3 Claims. (01. 220-67) -This invention relates to a head for glass lined tanks and more particularly to heads .of

the type employed in ceramic enameled tanks for water storage heaters such as thoseset forth in the United States Letters Patent No; 2,263,- 021 granted to Otto E. Uecker on November 18, 1941.

The principal object of the invention is to reduce .any tendency of the heads to buckle atthe knuckle radius under stresses caused by the radial contraction of the weld, and thereby to prevent possible injury to the enamel lining b reason of suchbuckling.

circumferencejust inside the weld to thereby provide a number of distributed points of weakness each receiving only a small part of the contraction stress referred to The invention is, illustrated in the accom- Danymg drawing in which: t a

Flgurelisanend viewoiatankwltha welded head; and.

Fig. .2 isa detail radial section through the joint between the head and shell oi the tank ,takenonline22oiFlg.1.

The tank comprises a cylindrical shell I, prer- 'erably having a flared end portion 2 for receiving a complementary circumferential "skirt 3 of the end head 4.

The shell l and head 4 are lined with ce-" ,ramic enamel 5, which lining extends W- ly between the overlanping sections of the flared portlon2andsklrt3h I The'skirt 3 preferably e endoi'theportion2 and weld metal ,isdepositedin-the oornerthus providedbetweenthe 'mltersurf'aeeoi'skirt3andtheendofportlon parts and secures them together to provide a tank that will withstand substantial internal 'lheeonis'actlonoi' theweld metal andthe adandheadcurntmes are'nottmlyclmularor 15 ferentially' to a single point of weakness.

point of weakness absorbs or relieves a part of,

as tribute-the same.

'2; In a tank, a cylindrical shell, a head havreadily results from too high a stress concentration in the metal beneath.

In carrying out the invention, a plurality of circumferentially spaced longitudinal grooves l 6 are cut in the innersuriace of the skirt 3 and extend from the outer end edge of'the skirt to a point between the weld 6' and the beginning of the knuckle curvature of the head. The grooves are preferably less deep than half the thickness 10 of the head.

By distributing grooves 1, preferably equally 4 spaced around the circumference, a plurality of points of weakness are provided that prevent transmittal of the contraction stresses circum- Each the contraction stresses and there is no undesirably large concentration of the stresses at any one location. By reason of the use of the in- 20 vention a thinner endhead and lighter weight tank may be employed without injury to the enamel in service.

:I'he invention may have various embodiments in accordance with the accompanying 35 claims.

I claim: 1. In a tank of the class described, a cylindrieal shell, 9. head having an outwardly extending'sklrt inserted in the end of said shell, and

a0 a weld joining the skirt to thejend of the shell,

said head skirt having a plurality of circumfer- ,entiallyspaced longitudinally extending grooves on its inner surface in the zone of said weld to relieve the welding contraction stresses and dising an outwardly extending skirt inserted in the end oi said shell, a ceramic enamel lining for said head and shell, and a weld joining said 4|) skirt and shell together at the outer edgesthereof only, said head skirt having a plurality of 1 predetermined circumi'erentlally Spaced thinned portions therein providing a plurality of weak points for relieving and distributing the 4s weldingtstress and protecting the enamel lining from stress concentration in the head.

3.1a a tank oi the class described, a cylindrical shell, a head'having-an outwardlyextending skirt inserted in the endo! said shell, and

60 a weld joining the skirt to the end of the shell -'at the outer edge oi. their overlapping portions. saidheadskirthavinga iluralltyoicircumfenentially spaced longitudinally extending grooves onits inner surface in the zone of said weld and extending to a-positlcn adjacent the inner edge of saldoverlapplng portions to relieve thewelding eontractionstressesand distribute them.

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